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cnc guys start drooling

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philf:

--- Quote from: Arbalist on March 14, 2013, 06:22:26 AM ---I'd really like to see the cutter shape and slow motion to fully appreciate the process!  :drool:

--- End quote ---

Lykle:
Wow

After I saw the first video I thought that they were somehow modifying the cutting bit depth during every rotation.
But now I see that maybe it just moves so fast that in combination with the rotation of the part is produces a flat surface.
So combining the two rotational speeds allows you to change the surface curvature. Clever. At least for the last video.

The other stuff, I must be using a movable cutter, how else can you cut a groove in a cylinder with almost straight sides?

But that gear! That will take some wrapping of brains around.

NeoTech:

--- Quote from: AdeV on March 14, 2013, 09:58:54 AM ---I think that's just the power drive to the active tooling, isn't it?

--- End quote ---

Been standing up close to a mechanical (not cnc) machine like these on a local machine shop.. The power tooling part is syncronized with the spindle at a gear ratio for most parts. with a shaft that drivs the tooling at an offset.. its basicly a spirograf.

The cnc versions have obvious benefits though.. deargod i want one. :D

NeoTech:
after some solidworkd simulation both tool and part is spinning in the same direction. part is spinning in 1:1 and tool is spinning in 2:1 if tool has 3 cutting surfaces if it has one surface it would be spinning 6:1 to generate the hexagonal shape.. angle of cut requires some tinkering with the ratios but that gear can be produced with similar math.. or just use the gcode for it if the machine has a powered spindle in the gang tooling setup. :)

philf:
The 'flat' faces produced aren't in fact flat but sections of an ellipse. The bigger the ratio of cutter to workpiece diameters, the nearer you get to a flat.

Unless I ever get many hundreds of hexes to produce I'll stick with my dividing head or a Stevensons Hex ER32 block.

Phil.

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